CVE-2021-38690

highpriority · track · 39EPSS 0.013 · 70 %ileEURUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.30% (70th) EPSS

CVSS 7.5 · high

Is it mine?

9 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-28

A stack buffer overflow vulnerability has been reported to affect QNAP device running QVR Elite, QVR Pro, QVR Guard. If exploited, this vulnerability allows attackers to execute arbitrary code. We have already fixed this vulnerability in the following versions of QVR Elite, QVR Pro, QVR Guard: QuTS hero h5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QuTS hero h4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 5.0.0: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Elite 2.1.4.0 (2021/12/06) and later QTS 4.5.4: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Pro 2.1.3.0 (2021/12/06) and later QTS 4.5.4: QVR Guard 2.1.3.0 (2021/12/06) and later QTS 5.0.0: QVR Guard 2.1.3.0 (2021/12/06) and later

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.1highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · security@qnapsecurity.com.twexploitability 2.2 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-120USCWE-120USCWE-121USCWE-787US

affected products (9)

Products and version ranges known to be affected.

QNAP Systems Inc. QVR Eliteunspecified → 2.1.4.0 (2021/12/06)enisa_euvdEU
QNAP Systems Inc. QVR Guardunspecified → 2.1.3.0 (2021/12/06)enisa_euvdEU
QNAP Systems Inc. QVR Prounspecified → 2.1.3.0 (2021/12/06)enisa_euvdEU
QNAP Systems, Inc. QVR Elite≤ 2.1.4.0 (2021/12/06)fstec_bduRU
QNAP Systems, Inc. QVR Guard≤ 2.1.3.0 (2021/12/06)fstec_bduRU
QNAP Systems, Inc. QVR Pro≤ 2.1.3.0 (2021/12/06)fstec_bduRU
qnap qvr elite< 2.1.4.0nvdUScpe:2.3:a:qnap:qvr_elite:*:*:*:*:*:*:*:*
qnap qvr guard< 2.1.3.0nvdUScpe:2.3:a:qnap:qvr_guard:*:*:*:*:*:*:*:*
qnap qvr pro< 2.1.3.0nvdUScpe:2.3:a:qnap:qvr_pro:*:*:*:*:*:*:*:*

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu nvd NVD CVE.org MITRE

published 2022-01-14modified 2026-06-17

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+16138 more

references (5)

External citations — patches, advisories, analysis.

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